When Systems Hold but Do Not Change: Threshold-Constrained Equilibrium in High-Variance Manufacturing Systems

Organizational theory has developed robust frameworks for understanding how systems adapt under changing conditions and how they fail when strain exceeds capacity. Less attention has been given to a third condition: organizations that sustain performance under constraint without collapsing and without achieving structural transformation. This paper introduces Threshold-Constrained Equilibrium (TCE) to describe this condition. TCE is a stable operating regime in which an organization functions persistently near the limits of its metabolization capacity, sustaining viability through continuous local adjustment while structural adaptive pathways remain constrained. The construct builds on prior work on Acceleration Without Metabolization (AWM), Organizational Metabolization Capacity (OMC), and Threshold Theory of Organizations (TTO), extending those frameworks by specifying the pre-threshold stable regime. The paper develops TCE's defining mechanism, constrained adaptive degrees of freedom, and its characteristic behavioral and performance signatures. Empirical illustration draws on cases from high-mix, low-volume manufacturing environments, where variability is intrinsic, standardization is partial, and capacity expansion is structurally limited. The analysis demonstrates that capability development continues under TCE but is absorbed into maintaining equilibrium rather than enabling transformation. Theoretical and practical implications are developed, including a reframing of the relationship between efficiency improvement, growth, and structural change in constrained systems.